Thank you! Yes we were planning on adding more things (upgrades, more enemies/progression and obviously score), but as usual in a game jam, time ran out. We also didn't have much time to test and play with the spawning of enemies. We might update the game so it's a bit closer to what we had in mind in the future :)
For the aiming comment: I believe making it possible to simply click between us and the tower would make the aiming aspect too trivial. At that point the game would almost only be about positioning well (which might still be fun, but I wanted the game to be about aiming too). Also it might cause an issue where you could easily just target a tower across the map accidentally (although we probably could limit it to the camera view only, but at that point yeah the coding becomes a bit more complex). What I'm trying to say is, yes it's hard, it's by design, getgud ;) (jk thanks for playing!)