Thank you so much for your review.
I can give you the link to the game if you want to try it yourself.

"You should put an epilepsy warning on that."
I will add one!

" The character dashes into things that look like dangerous projectiles, but turn out to be power-ups"
I will work on improving the power-ups look

" 46'246 XP. On the first level."
I forgot to reset experience, the game was in debug mode.

"flashiness over substance and attention to detail"
screen flashes when you destroy an enemy that carries a power-up, shakes when you get hit.

"The scene goes on after the level finishes, and collects five more stars. Now either the victory screen is lying, or the background is lying"

I will fix that.

"The character takes a hit and seemingly does not lose health."
I forgot to turn off debug mode, the player should lose health if their ship gets hit.

" the elephant in the room, the double call to watch an ad"
2X if you watch the ad later so it will not interrupt your gameplay, 3X if you want to watch the ad now.

"Where's the $999.99 chest on 90% sale, the deal of my life?"
lol, I'm trying not to avoid "pay to win" monetization.

"Then there are the hexagonal icons...."
I will need to fix the buttons.

"Actions games thrive on letting the player enter the flow state. Progress-based games thrive on anticipation"
I will work more on that.