As others commented, the tutorial button may have been its own button on the map, I found it and got to play. Another idea could be on hover show what each button does. I did get a self collision error and first time got bumped super high, and the other one flew far away from the game arena. That being said, having a cool turret defense in front of you and adding powers to them with flyovers and drops was super cool to watch. Altogether great job!
Also like that we had similar lines of thought on the title =) Excellent promo image too.