4/5. Great game overall, but it's annoying that you can't completely turn the sounds off even though you can turn the sound off/on. Specifically speaking, that noice at the end of the ramp.
I have 1 suggestion. To be able to move the towers instead of selling them and buying them again, that also loses money. If we can just move them, it will be less troublesome.
This game has a lot of potential!!!! You have some great artwork here. The idea and premise are sound. Need to tend to some details that defy logic and just encourage player resistance. The sounds are nice and fit. The story is fine, I think you could work it out a little more. Upgrades and shop might need a once over to balance out with difficulty. I wish you the best of luck in future game. I hope you make a #2 because I could spend hours playing this type of game, it's unfortunate it only took about 10 minuets to beat this version. Please make a campaign, or missions, or something to increase the playability of your great game. Needs a little more testing, seems like a lot of work to get ripped on for being too short. Anyway cheers! 5/5