Good game! The art looks nice, & I really like how you combined the incompatibale genres of roguelikes & tower defense games! Honestly, this would be a really fun game on IOS & Android with more towers & upgrades.
My biggest gripe would be there isn't much in the way of strategy with the game. You just kind of upgrade towers & watch the slimes get pulverised, which gets boring pretty quickly. I think the aforementioned solution of more towers & upgrades could defintely help with this, as well as more diverse enemy types.
Overall, great game, & I would love to see it on mobile!