A 10/10. The idea of having everything worth 1 life is superb. The towers are great. Maps are varied and challenging for a first time try. Truly needs strategy to win. It definitely is an all-around great game. You should make a second version with more levels and towers. I really had to think about what to do when I lost. Making paths with towers is also quite fun. It's like Tower Defense meets Choose your path almost.
Again 10/10!
-Atoms12123
P.S. If you haven't played this you really should. It's really a great game to play in spare time.
I just find that this game relies too much on getting the first funnel finished than any actual tactics on where to place towers. Would like to see some more difficulty, or maybe a difficulty setting where enemies have more hp, etc.