The spaceship part has three stages, so you were in the final stage of the spaceship. When dying in the final stage, you should automatically appear on the first tetris level (tetris minitutorial). I still don't understand what happened within the code... I tried to replicate your bug, but it worked well for me on different tries with different browsers (Firefox, Chrome & Edge).
Sorry to hear that, but I'm not able to repeat your bug. Could you tell me in which stage were you when it crashed? Were you controlling a spaceship or a tetris piece? The last part of the spaceship should be quite difficult, as it is designed to kill you eventually (it's an endless level), but a game over menu should appear when you die if you don't reach a certain threshold to pass to the next level. :(
The tetris piece stage has two parts. If you are in the first one (which is a mini tutorial that shows you the controls), you need to press Space while you are not moving to pass to the next part. So, before pressing Space, you need to press Down key so that the piece stays in place on the right side of the screen. If you are in the second part of the tetris stage (where you play Tetris as you know), the piece should stop when hitting the top-base wall (if it doesn't, it's a bug that I haven't experienced). Hope it helps you!
Glad you enjoyed it! Now that you mention it, I think I just realized where the bug is. The way I handle line detection is a little awkward, and it seems that I don't check whether a line is full of blocks if there aren't any blocks on at least one line above the completed line. I'll update the game as soon as I can. Thanks for letting me know!
