I thought about this Post for a few days for now and finally decided to write it down.
What I'm going to post are a few minor problems the game has that schould be (at least what I know about how it works, but correct me if I'm wrong) very easy to be fixed. What I'm not gonna suggest are the things that are mentioned every update or in every second post (like repair system removal, problems with crashes, bugs, etc.). But lets get started:
There are a few flaws with this one.
Arcade Mode missions should be removed from the table.
This is due to the fact, that they are pretty boring to play anyways, but furthermore if you got to play the same mission 6 times in a row, it gets even worse. Also the intended way to play arcade is to play all missions to get your reward, so if you just play one mission the whole day you dont get any reward (besides the mission reward of course).
Remove the Killing Mission in combination with TD Mode.
The main purpose of TD is not to kill others but to score (obviously). So I don't get why it should be a mission to kill if your objective is something totally different.
Reduce the amount of killings necessery for the second and third reward.
This is for a few reasons, the amount of TDs needed for a reward is 1/2/3, so it is possible to play three matches until you are finished. In DM this is often not that easy, either you have not enyough players in one match to kill enough throuout one match or there are way too many players that you can't kill enough until the match is finished. Either way it can't be compared to the amount of matches for TD mission. It seems to me that it would sometimes be even faster to just get the 'play 3 times' mission instead of 'kill 60 enemys'. And if I have not only to play but also do something specific while playing this should at least be possibly faster (without a tremendous effort). To conclude this I would assume to just stack it like the TD mission to 10/20/30 kills.
Introduce a sub-mission for Chaser.
The objective should be to kill an amount of players as Chaser each match just like score TD or kill enemys, so that every mode has a specific sub-mission fitting the main mode. I'm not sure about the amount though, but i guess 5/10/15 would be good.
Daily login rewards:
The main problem I have got with this is, that even S4 ranked players get an exp-boost, that is pretty much useless. So while thinking of changing the rewards for S4 ranks for this purpose I thought it would be nice to change the rewards for them a bit further. This is also due to the fact that S4 ranks don't have any benefit from being highest level. At least a bit amount of bonus would be nice (or at least no disadvantage due to a useless item). So the exp boost should be removed and instead another pen boost would be fitting.
For the other changes at least one coupon capsule should be replaced with a pen capsule or an esper capsule. This could also be aplied to all players regardless of their level, cause the coupon capsules are as useful as the coupon shop itself.
The Esper Chip capsules should be replaced or changed. Most of the chips you will get out of them are useless cause there are 6 slots you can get chips for. These are the 4 clothes slots you can also get the new Esper chips for, pet slot and weapon slot. The major problem is that nearly all if not all old Esper chips for the clothes can't compete with the new ones and these are way easier to get and also are permanent. So the remaining are pet chips and weapon chips. At least I can only count 4 chips that remain. The amount of chips that you possibly can get are way more, so the chances of a useful chip are extremly low. And this chip also only lasts 1 day, at least from my experience I only got 1 day chips out of these capsules. The next problem with these capsules is that they seem to have a higher chance to drop from the shop than anything else.
A way better alternative would be to just give the new Esper chip capsules. these have way more value and a better chance to give a useful item. Also this would be a way to obtain Esper chip extractors which are unobtainable in the game at the moment (except if you pay for them). Another possibility would be if you cuold get permanent old Esper chips out of the capsules. this way at least the permanent weapon or pet chips would have value (especially the weapon chips). And since the chances are still pretty low, this wouldn't be any reason for paying players to buy less (since this is the only way I know to get permanent weapon chips atm).
The random weapon/clothes capsules should be changed. First reason for this is that due to daily login and daily mission rewards even players without permanent equipment get enough premium stat weapons/chlothes that make these useless. Second the chances that you get especially that weapon you want to play is extremly low and even if it lasts for just one day. Third since these only 1 day you can't even dismantle them to make at least a bit use out of it. I don't exactly know how to make these more useful, but at least it should be possible to get items for up to 35 days like with normal capsules.
If you think in another way be free to comment, also if you have more suggestions like that.