Hi Sephazon!
Outstanding work. The mechanic of taking over the monsters reminded me of Super Mario Odyssey. It was well implemented in this excellent retro style. Love the art and music, incredible stuff!
One minor suggestion - It would be cool if you indicated to the player what the monster's power is. For example, with the turtle, maybe you could display a water block somewhere in the HUD so that the player knows that they can traverse water with it. I know its obvious for the turtle, but I wasn't sure what the point of the octopus looking thing was!
This would also be a cool way to incentivize the player to keep dungeon delving. You could give the player a monster they do not need for, say, 3 minutes or so, but they will join with them anyway because its new and unique. They see the hint as to what that monster is used for, and then later in the dungeon they know which one to pick to solve the puzzle!
This is top tier stuff and something I would definitely pay for. Good work and good luck in the jam!
Best,
Brandon from TheIndieDream