Alright, but...
I like the game itself, but there are a few things that could have been done better.
As other people mentioned a pause and a mute button are always nice to have, atleast give us a break between levels.
Then there's the selection screen at the beginning...
A little vid showing what the different weapons fire like would be nice, or a short explanation.
For example, I noticed that the regenerator disappears after a while, while the cluster missiles stay. Would be good to know beforehand.
The different looks should translate into the game, if you had no intention of doing multiple in-game models of the ship, don't show different versions of it on the selection screen.
Also, more power levels for the main gun, as it is right now, the photon helix is the only good weapon IMHO.
Last but not least, enemies often start fireing while they're still off-screen. Is kinda confusing most of the time.
Overall, solid shmup, but could've been better.