The Great Defense

A very good start to a simple tower defence game. There are several things you did very well here, such as making a distinct difference between the various enemies both by colour, speed, health, and the amount of cash rewarded, having an accurate high score counter and having a decent turret AI. However there are some obvious potential improvements. Since this is a speed conscious TD game, meaning that you will have to place turrets mid-round often in order to succeed, I recommend a pause, play, speed up/down function, so that players are able to plan out their defence. Maybe you could also provide information on how each turret and enemy behaves, such as speed, health/attack per shot, and
money reward/cost. Aesthetically, you could add a round counter, and make the highscore counter on the main menu more clear. If you plan to improve this game with better resources, I suggest adding music and sound effects, a more complex track or track selection, and making a difficulty setting.

303 was my max kills with 80 health

I actually enjoyed the turret placement mechanic, my suggestion is you could use that turret placement bar as a passive upgrade if you wanted or incorporate a wired buff system that focuses on specific "wired" emplacements. That way if you could allow players to passively buff their turrets depending on the way they placed them.