Not trashy at all
This is a fair tower defense game and the idea to have bots specialising in a single type of enemy is quite a nice idea.
However, it lacks a few features to make it a staple. Towers should either be upgradeable to increase their strength and range, or more different types of towers should be available to make up for that. The slowing tower is unbalanced as of yet and not really worth its high price, I didn't check out the paralysing tower.
And maybe there should be data given for the next wave (amount/type of enemies, maybe also size), so that the player is able to gauge its extent and prepare by setting the right types of towers.