I've been hard at work on this game and am going to keep going until it is 'complete'.
A few additions: I've modified the whole system so that everything has hit points (including shots). That makes it much easier to create more and more powerful enemies and ramp up the difficulty. I've also made collecting the score multipliers essential because they also up your shots one hitpoint for every 10 collected. If you get far without collecting multipliers the enemies will eventually become very hard to destroy.
Also a multiplier drop is now guaranteed every 10 enemies destroyed (since they are now essential), and there is still a 5% chance of one being dropped randomly.
I improved the UI quite a bit and built an achievement system (15 achievments and counting).
I also added a proper title screen.
Also on my list is a 'shiny' mode for those that want it with lots of cool lighting and neon effects. This is totally hinging on me being able to figure that out lol.
New video coming soon.