It was pretty fun to play and I managed to beat one boss. Graphics looks neat. I like the fact that you can go faster by going forwards, usually in such games(that I played) you just move forward without boost. Music and sound effects were good. Ship designs looks good, but I'd suggest to make player ship more vibrant. Some times when I was looking at the right side I didn't notice how asteroids hit it, because they are similar size and colour.
One thing I didn't understood. What is the point of a 'fat' green ships, they don't attack.
I found strange bug but I couldn't reproduce it. Some times I'd stuck in upgrade menu and I couldn't jump to new dimension or exit to main menu.