Someone asked me yesterday what the progression and upgrade system will be for OctorSpace and well its a game where people can make levels themselves. Introducing upgrades suddenly turns into a whole other beast as then the game gets more challenging to test. Rather than dropping in and testing a level you need to incorporate giving upgrades to anyone making their own levels.
To compensate for this and to again make it different from AquaNimble there are now power-ups in OctorSpace. Players can hold one power-up at a time and taking damage will lose the power-up. When you have a power up your vessel has an aura around it indicating what you have. This could be a temporary visual solution. What you picked up also pops up in the corner. Having the pop up should solve AquaNimble’s problem of no one understanding what they just collected even when they’re marked with letters.