Hello there and thanks for trying the game!
You should have provided a download link in your post in the Feedback forums, so you could have made more improvements on Synchro before making posting it in the Announcements. However, since you didn't, here is my feedback.
I posted the game on quite a few forums, and unfortunately forgot to post it here until a week or so before the release date, in which I had already removed the demo from being downloaded. Oops!
For some weird reason, I could gain energy while simply shooting at enemies. I think it has something to do with destroying enemies within a close proximity to the player's sphere, but I'm not completely sure how it works. I can get up to 140% around level 5 or 6 if I do it right.
I'm not sure what you mean here. 140% of what? Hehe
With that said, why are there are no instructions for the game? Every game should at least have a readme or manual file available within its root directory or some in-game instructions to provide all the basic information about controls and how the game works. I still don't know how to get my perks to work, how to properly use the spacebar, nor what the "nukes" are. Also, where are the online highscores?
You're definitely right. I'll write up a readme and include it for download in the .zip file (and for solitary download for those who already have the game). As for using powerups, when you fill up your bar by killing enemies you press space to issue you a random powerup (nuke, double fire or health). The point of the game is to just destroy as many enemies as possible, passing through as many waves as possible in the shortest amount of time as possible. Finally, if you go to "Highscores" and hit "Submit" you submit your highest score for a single game.
I liked the game enough to continue to bother with upgrading, but I've reached a point that I feel like all the extra memory I have accumulated so far will simply sit unused.
There's quite a bit to buy, so for awhile it shouldn't go unused. But I supposed once you've maxed everything out then yeah, it will