This is only my subjective outlook and my opinion regarding to your game but I'll do my best to give your game a feedback.
Well pretty polished juicy bare-bone game. Kill mobs, earn coins, get an upgrade and repeat. It seems the game focused more into upgrade feature rather than the actual gameplay itself. The mobs randomly spawns and aimlessly goes towards the player and it is very overwhelming especially if boss mobs entered the ring. Using knight is easy however, using soldier is pretty difficult. It's very frustrating if my shooting type character was not aiming at harder mobs. Furthermore, It is difficult if I couldn't control where my shooting character aims. Moreover I get overwhelmed of how many enemies they are from time to time. Also it is very frustrating if I was using "Soldier" and I wanted to get the coins dropped from the ground and suddenly the battalion of mobs blocking my way even "space" wouldn't save me in that situation. If you are planning to stay on that shooting feature, I suggest you should add bullet hell feature on your shooting-type character where the bullets spread across the area which makes the game even balanced if your character aims at different mob, as balanced as the knight character.
I was planning to try 2 player mode on your game because it was seem fun if I use both soldier and knight, a shooter and a tank. However, where is the confirm control for the player-2??
When I was playing on stage 1, I was VERY FRUSTRATED on why I couldn't even confirm my next abilities for my player-2
I was stuck in this situation that I couldn't even continue playing the game.
Well, that is my feedback for now and I'm looking forward for progress in this game. Anyways, other than that, I've enjoy the game, especially the sprites are fascinating! Good job on anime portraits for the characters. :D
Looking forward for next updates!