Some suggestions...!

[cunning mountain]

Might update the list as I go, and who knows if any of these things will ever happen, but oh well.
- Improve the gacha/summon rates for both general summons/summoning horn.
The chance of getting anything beyond a common or even a rare hero is absolutely abysmal. I feel like there's other gacha games that are more balanced than this game, and I really think it needs to be improved soon. At the very least, they should increase the chance for epic heroes to be summoned and stuff, if nothing else.

- Enable the redeemable codes to be accessible to everyone instead of a limited number that can use them.
It's weird that they set this up only for a specific amount of users to be able to use them. Also feels kind of unfair and I think everyone should be given a chance to use the codes at least once without there being only a limited number of players that get to use them.

- Update the conversion rate for Dragon Crystals to Wyrmarrows or vice versa.
I feel like it's maybe a little odd or unfair, almost, that 1 dragon crystal only equals 1 wyrmarrow in return? It's especially weird considering the way that it only really looks like you can use dragon crystals just to get more wyrmarrows as far as I know. Maybe, like, 1 dragon crystal should equal 3-5 more wyrmarrows, at the very least?

- Potentially provide more easily accessible/free ways to obtain Wyrmarrows more frequently!
Something like the daily check-ins kind of helps with this, but I think there should be some more things that could potentially come with log-ins like for special events and holidays, etc.
I've played games like Fire Emblem: Heroes and Granblue Fantasy where one game either offered lots of chances for the premium currency to be given for free (especially if it's a returning player that hasn't logged in for a certain amount of time as a "welcome back" reward") or where GBF literally offers like, free summoning rolls for the duration of a week or two for things like the game's anniversary and other holidays that would be pretty nice to have here in some way!