In general I could have liked the game pretty much because I like those games a lot. However, the enemies had an attack range of way too far. I thought I dodged them, but that was not possible. Died in seconds since the waves got bigger, which was super sad. Also at least some sounds for the attacks and spells as well as at least an indication, that I have hit an enemy would have been really nice.
But I want to appreciate the look of the character and the slimes as well as I liked the music. This is a great basic concept and I emphasize to keep working on that project a little bit more because some really minor improvements can bring that game to shine. Keep on working, your job so far has potential.