Tested the game with a couple of friends, did a couple of quick fights and erased a Lightweight 3-bar boss in a single action (Ten Thousand Gunkata Style + One-Two Form with 10 power tokens). It was cool and hilarious, exactly the vibe we want out of a game like this, but we were also sitting around with our jaws on the table for a bit.
The power tokens are the thing we're wondering about - I set it up with Training Teacher Style + Song Form, and it seems like Training tokens (or Take Aim from Crosshair) would boost a lot more things in Sing Along than seems intended? To run through it, with all the variables in bold caps:
1+ or 4+ or 6+: Sing Along
Choose ONE ally you can see. Choose ONE: They remove ONE token they hold; they heal; or they gain TWO tokens from your song.
4+: They also choose ONE from the list.
6+: Add a 4 to their Action Pool. They must immediately spend it on an Action.
With just one of Training or Take Aim, you spread the move to two allies, each of them gets two picks from the basic list - and both the token options are buffed too! - and you give both of them a free instant off-turn 5 action. With both a Training token and Take Aim (both of which should stack in either order, because Training a Take Aim would increase the cost and all values of the next action by +2 anyway), you can target three people, who take all three actions on the list twice and then get a 6 action (and if you target yourself, you can also then use the 6 for *another* maxed Sing Along on a single ally). If you roll well, you can do this twice on a turn in Crosshair Song or Training Song, which is what I did to generate 10 tokens for two allies in a single round of prep.
It was incredibly fun and satisfying, but also felt unintentionally powerful? I'm wondering if there's something about it we overlooked or if it's going to get addressed in the errata, or if it's just an explosive payoff for spending a turn (and a good roll, since it costs at least a 3 and a 5 to stack tokens or a 7 for the free action) on fully selfless support for a more aggressive ally.
Edit for context: it did also take specifically a rate-of-fire character to spend those tokens over multiple attacks, and it was a Lightweight 9x3 boss and he had to plan out which attack would happen when to keep her in range and not waste damage, so it wasn't exactly a win button even still, but, again, jaws dropped for a little bit.