Hey!
While checking out the forums I found this post and wanted to give some feedback.
The controls are pretty simple, so everything was relatively clear even without a tutorial.
I think the main aspect I would work on is the shooting. While it's responsive and the particle effects look great (destroying drones feels very responsive), the visual dose'nt seem responsive enough to make it feel "satisfying", tho maybe that's just my taste. If I spam the space bar, I would expect it to give me more feedback, like a slight recoil effect or even a camera shake when your weapon overheats.
You could also add a clear representation of what you're protecting, like a laser barrier which the enemy drones should'nt cross instead of them just despawning.
One thing I think you nailed is the UI, it looks great, tho It could be more responsive in some places like the score counter having some effect when increasing.
I would say the difficulty is pretty balanced, at least for beginners.
Overall I think that you're project definitely has potential.