This was a really nice and solid tower defense game! I liked the idea of having two different types of enemies, the ground and air ones. This makes placing towers a lot more tricky, because you have to think what kind of tower should go in the most optimal spot. Great stuff!
At the very beginning I was unsure where I should place my towers, because I had no idea where the enemies would come from. Maybe instead of the road just vanishing off screen it would be clearer to have some kind of castle or fort you are defending? Or at least some other way to make it clear which way the enemies will go.
I also thought it was a shame the game ended after 40 rounds. It could have been interesting to maybe have fewer rounds, but different locations or different paths. But I guess you know this :) I was also wondering what the extra loops in the game are for, as the enemies never seem to take those paths?
From a gameplay perspective everything worked great. For me it was actually pretty clear what the house did. Does it just generate more money like it says in the top right? It took me a bit of time to figure out I could also upgrade my towers, but I liked it a lot when I did! The staggering ability on the ground units is a bit overpowered though, haha XD
Very nicely made and a great submission for the jam! I enjoyed this a lot, thanks for making it ^_^