The game's pretty fun. I would rate this higher if it weren't for the fact that there is an incredibly boring metaprogression system. All upgrades between runs are vertical, making the game easier as you play (unlike games like Rogue Legacy or The Binding of Isaac, where there is vertical and horizontal progression such as new classes etc.). The game has some metroidvania-ey systems where you can unlock alternative paths by finding secrets, but they don't differ that much from the original one.

TL;DR the game is pretty fun but has half-baked implementations of systems from other games in the genre.