I had a few bugs where round 5 showed two enemies left, but third try lead to victory. I liked how customizable the towers were, not sure I fully understood the ramifications of any of my choices with them though, like the cannon not being able to shoot the pink dudes? Definitely think that once you choose a type or an element the others get greyed out so you don't think you can purchase them anymore. A minor thing: music seemed a little quiet in game, especially compared to the menu music.
All in all it's a really solid start to a tower defense game, which is great to see in a jam! it's tough when technical things like previews and grids take up valuable time that you wanted to use on the gameplay side of things, but this is still a complete thing, so that's pretty great :)