My first Suggestion would be to redo the Super Forms System, because right now there's only clothes and buff for them. It would be better if they were techs for the head piece.
Here's how i would like them to work:
You would press F to ascend to super saiyan, and G to descend.
If you have Super saiyan 2 tech, you would first ascend to normal super saiyan, and then if you press F again, you will be Super saiyan 2.
Oozaru would require the Oozaru tech, and it would increase your Size by 2x or something.
Every form increases your damage boost, defense, health, energy and speed.
Super Saiyans have auras which emit light when active, and can be deactivated by double-tapping down (Or CTRL+F or something else). Super saiyans with electric auras do electric damage.

Now, as for my second suggestion, improve the Ki Attacks.
First idea would be to add in stances when charging the attacks, Ki blasts don't need them, only Ki Waves and Ki Barrages and... Huge Ki Blasts need them. Ex: Kamehameha take the Kamehameha stance and etc.
The second idea would be to make ki attacks start from your hand and then it becomes longer the longer you hold it, and it would continue to travel distances if you stop.

Now, for my third suggestion, better flight.
Make the flight technique into an actual tech by turning it into a legging tech.
You activate it by double-tapping jump.
It will slowly drain your energy the longer you fly, plus it negates fall damage (too op, do something about this).
You fly around by pressing WASD.
There's also a fly animation for it.

For my fourth and last suggestion for now, fists.
Make fists the main weapons for the saiyans.
Make the fists upgradable in some ways, or make a leveling system for the fists if that is even possible.

I might make more suggestions in the future, hope you find these suggestions quite interesting :)