Nice job on the update! Here's my feedback.
- While I can appreciate the added freedom and more straight forward nature of the gun sequencer it takes up a lot of space on the screen. Maybe being able to either hide the gun sequencer and/or only show the gun sequencer in-between waves would be better?
- The feedback on the blobs is really nice.
- I don't take damage? I'm not sure if this is intentional or not because you said the game is in a sandboxy mode right now.
- Showing a timer or being able to manually start the next wave instead of it spontaneously appearing would be appreciated.
- Bullet trails points towards the player's current position rather than the spot where it was shot from.
I'm not sure if you know these things but I'll say them just incase you don't realize them. If you already understand and recognize these then just ignore this part.
- Gaining more space on the gun sequencer isn't necessarily a benefit for the player. Having less spaces on the sequencer makes it's far easier to have rapid streams of bullets without stopping.
- The invincibility frames on the blobs indirectly nerf the multi-shot guns. Since the blobs go into invincibility after a single bullet you can't hit the same blob again with the other bullets of a multi-shot since they've already passed through the blob by the time the invincibility is over. Personally I like being able to shotgun a single enemy.