It is really cute and I like the animations. Having the houses fill and clear the mines away helps keep the field clear so you are focusing on the "front-line" -- I may add that as an option or variant to my game.
My only critique is that you can't tell how many mines are next to each slime type until you have trial or error. It would be nice to have numbers on the slimes, or as a tooltip, at least at the start.