This is awesome. I really like the wave design and the starbase is so good.

One thing about the pickups though .. They seem really rare which is ok but going sideways can feel really annoying especially when killing an enemy close to edge to have pickup disappear off screen 0.2 seconds later. Could maybe still go sideways (for extra risk in getting them) but always go the max distance to side of screen maybe (so if dropped on left goes to right and on right goes to left etc).