Really good game
Hey...
this is a really good game! It's a bit short and repetitive, but what you have is really nice.
It's fun, execellent choice of music, the super cannon blasters are really nice, really retro style.
Improvements: Make the upgrades automatic or something fun and obvious, like an upgrade ball you have to shoot, or maybe just slide down to the base for a "boost" at the base? Even x/z is a bit pointless. It just doesn't work as it is.
Add some more variety too. And make the weapons look more impressive when they get upgraded.