I see what you're going for with this game, and I think with some polish it could be a lot better. But as a player, I felt very limited in my choices, especially since I don't know what each move does.
Take the slime for example. You have the choice of "Slime Shot" or "Solidify". "Slime Shot" sounds like an attack, so I'll use that to attack. "Solidify", I'm not entirely sure. Maybe it'll brace some damage? Regardless, "Slime Shot" wasn't enough to kill the hero, so I reincarnated as the Phoenix. Suddenly I have "Fireball" and "Burrow". "Fireball" is an attack, but maybe so is "Burrow"? Some clarity on what these moves do would help a lot.
Also, I know that there was a 48 hour deadline, but when I become a stronger monster, it would be nice to have that monster's sprite as my own rather than the slime.
Overall, I think this game can be fixed up a tad, and then maybe the game is going to be a little bit more enjoyable.