Appears to be broken for me. Tower graphics seem to get placed immediately - underneath the tower selection button. Wave counter ticks down, but no enemies come.
I like the concept, but the game is unfinished. controls are not intuitive. It's not obvious how to rotate mirrors (1 + 2 btw), I couldn't see how much money i had left. The different map types have no images to identify the differences.
In it's current state, this game is worth a 3, but has potential for a 4 or 5.
It has some potential. Catchy music. You'd probably need to introduce a scoring system, money to buy different weapons, moving enemies, death etc. to make it a bit more interesting.
Try not to use red with a green background (or vice versa). Not nice for us poor red-green colour blind people (roughly 6% of males).
It's alright..
I found the gameplay a bit frustrating. Perhaps you could make it easier by adding in some hitpoint and a health bar instead of 1 hit = death.
Also, easy mode, infinite lives is broken as other have pointed out.
Not really a game for me, but i think some will like it.