The Slash looks amazing! The gameloop is clear. And I like the minimalistic color palette choice!
Few suggestions tho:
- Swapping HP bar with XP bar - Health is a more important resource and at first I was confused what is what
- Make the game faster at the begining - lower the price of first few upgrades, lower the hp of the enemies on early stages
- Player's sprite is visible for 100% of the game - you should give it a little more love, meaning it should look a little better/ be animated (Like Slash)
Other than that, working roguelite in a gamejam is an amazing achievement.
Good job!