After reading your reviews and feedbacks on our game, we decided to meke few changes. First of all, we have changed order of unlocking heroes. Few of you had problem starting the game as Wizard so now starting hero is Gunslinger, after that you can unlock other heroes. Also, we have adjusted few achievements, so now you can unlock heroes easier. For you that had already completed achievements everything will stay the same. After that we made few changes in enemy logic, adjusted health, demage and spawn logic, to make game even more dynamic. Also fixed a most of the bugs you reported.
Software Wolf Studio game dev Team