yes it would be nicer if you could click where you wanted to go (and maybe highlight your options... But I have been waiting for something like this for a while, would be interested in a version 2 with more options and a slightly better interface.
on the ones where you are supposed to stack evenly on both sides and then place a big one on top such as level 12, place all small blocks on one side and the large one on the other
not bad for the first time, considering a game like it, found a glitch. On play again it doesn't reset the hit boxes or something, but it is impossible to lose. So get that straightened out before setting up high scores.
When you think about it almost nothing is copied, all graphics and sounds are original, even recorded some myself. Code wise, less than 10% is from the shootorial, and most of that is different in some way. More bosses, progressing enemy difficulty, and not just talking about bosses, and a gun that improves with the number of kills.
I thought the difficulty ramp was a bit slow, and the red bosses glitched, your boss timers count even when there is already a boss out there. It is not neccesarily a bad thing, but the red boss i apparently didnt kill in time, and a second came out and the health no longer changed and was unable to kill the boss because the hits didnt hurt it anymore. Otherwise not as bad as the other comments make it out to be.