Nice and fun game! It was interesting that there were lots of tower options possible to mix and match. But also, the enemy waves were quite relentless so I found myself mostly spamming towers without thinking too much. The component drops were sufficient to build whatever I wanted. From a UI point of view you could consider adding component counts to keep it compact. Sometimes the enemy would appear in front of the dropped components so I couldn't pick them up until the enemy passed. In future, different enemy types, more gap between enemy waves, pause, and some general balancing will make this more fun. Good work overall!