Solid game, managed to reach the end game with a full screen of towers. My thoughts:
* The art is really well done. The only nitpick is that the variable outline thickness feels a bit weird.
* The idea of time as a resource here is interesting in theory, but in playing it feels more just like any other currency, because once you produce more fuel than you spend, it is impossible to run out of time.
* The walls are really hard to use because the enemies are so fast and can attack through the walls if the tower is close enough.
* I wouldn't say the balancing of the enemies is terrible like the other guy, but I do think it could use some work. Particularly because in a jam game it's important that the game isn't not too hard to see all the content your game has to offer.