'tis fun and pretty. Movement feels pretty good too and I appreciate the squashing of bugs. However I didn't quite understand how to upgrade / level up things, maybe the UI isn't finished yet.

Simple and somewhat familar premise but execute with so much juice that it's hard to care, and it still manages to defy expectations in a number of ways. 

Off the bat the sound and music is good, really fucking good. Very satisfying and creates a lot of atmosphere that the game wouldn't have otherwise. Immediately makes a good impression. 

The decision to go with handcrafted levels rather than using proc gen was a very good choice too, made playing the game a lot more satisfying initially since you can come to grips with enemy patterns before being introduced to new ones which cause you to perform the "combat dance" of the game a little differently. It seems like there's a degree of randomness with what class is available to the player at the beginning of the floor that does tap into some of that roguelite RNG fun potential. 

I had a hard time figuring out what the point of the "poisoner" class was supposed to do that the firestarter class didn't do better, but it was admittedly my least played class. Firestarter was harder to come to grips with than fighter but is very satisfying once you do. (protip: run to agro all the enemies until you reach the locked gate, then use the AOE to take groups of them out at once)

Good game, really can't think of any compelling reason to critique it as a free product. If you plan on selling it on Steam I think that a little bit of exposition and worldbuilding would be called for, but it's a very fun little game as it stands now. 

Everything was moving so fast, it was borderline unplayable. The fire effects were flickering so quickly I'm wondering if its moving faster than designed.

Would you mind if I DM'd you?

You made that in GMK? I'm so sorry, but it's okay because I can do the same exact thing only I'm not bound by royalty fees.