- Does the aiming line feel clear and reliable?
It is definitely clear, and reliable for at least the first bounce. I noticed a couple times, particularly near block corners, where the balls did not hit the second bounce I'd seen, though it is possible that the mouse moved ever so slightly as I released the button; since the angle changes rapidly near corners, that might have been enough to change the trajectory from what I saw when I started releasing the button. I don't recall any surprises with bounces further from the corners.
- Do the levels feel fair as they go from easy to hard?
I stopped after 21; it seemed like a pretty reasonable ramp up to that point.
- Does the game feel good on both desktop and mobile browsers?
It seemed fast enough on desktop, but in fullscreen mode on a 1600x900 display, some elements (the damage powerup button, for example) were off-screen; leaving fullscreen mode allowed me to scroll down to it.
- Does the game become more satisfying as the ball count increases?
It seemed like the hit count for individual blocks in the levels kept increasing along with the increased number of balls, so it didn't seem like I was destroying more blocks or making faster progress. Since more balls also take more time to animate, when I made a mistake, it took longer to correct.
- Is the UI flow understandable?
Yes
- Does anything feel confusing, slow, unnecessary, or missing?
In fullscreen mode, if I started aiming on one side (left or right) of the screen, and then moved to aim on the other side, the background became blue instead of green, and I wasn't sure why, so that was a little confusing. I only saw this in fullscreen mode (browser is Firefox 140.12.0esr if that matters).
I wasn't sure what enabled the powershot; specifically, whether it was set for a particular turn in each level, or whether there was something I did to enable it.
I wondered if the "nice shot", "great shot" and "magic shot" pop-ups meant anything mechanically, or were just there to add a little punch. Punch is reason enough, I just wasn't sure, in particular since I didn't know what enabled the powershot and wondered if this might be related somehow.It might be missing some variety in the powerups and/or block types.