In general the game is cool. I really like the slime artwork and the music choice is great. Was that from an asset pack or did you compose them by yourself?
A little hint: CTRL is not a good choice for slow mo when building for WEBGL because a lot of browsers tend to provide out of the box short cuts related to control. Especially with WASD keys. E.g.: CTRL+W --> Close Tab xD So yeah, shutting down the game is kind of a time freeze :D