I'll try not to disappoint you. :U
Anyways, might as well list down the upgrades i've planned so far...

Weapons:
- Gatling upgrade (done, double rate of fire with weaker bullets)
- Spread fire (multiple bullets per shot, perhaps lower rate of fire)
- Bigger shots (increased damage)
- Splinter upgrade (adds some sort of splash damage to shots, perhaps lower rate of fire)
- Bullet speed upgrade (faster bullets, maybe increased damage)
- TMER upgrade (short for Techno-Magical Energy Ray, shots hit instantly, damage may be increased or reduced)

Other:
- Armor upgrade (increases damage resistance)
- Thruster upgrade (increases mobility)
- Shield (multiple levels)
- Regeneration (maybe multiple levels, slowly replenishes health)

Uhh yeah. I'll have to think of more "other" upgrades. Also, spot the references to players in the community. :U

Edit: Oh yeah, and all the upgrades are additive, meaning that none of them exclude others. The TMER upgrade does render the bullet speed upgrade obsolete though, which i'll have to think about.