Fine game. Having played Cover Orange and similar games, this was easy. The beam from the spaceship does not push blocks, unlike the other games, so even unstable constructions will win.
The game doesn't save and can have medal inconsistencies (on my first playthrough I only got the level 12 medal). If the medals don't save, probably best to just restart.
Either I missed the solution or level 23 really is hard, it requires pixel precision. Took many more attemps than 24.