Thanks for playing the game!
Yes, the enemies being able to damage you while falling was intentional, to play with the verticality of the levels. But, it's definitely something I'd understand people not enjoying, so I'd likely change it if I was to turn this in to a full-game.
I'd also agree with the idea of adding more depth to the dice rolls. I get what you mean in how your idea would take away from the "roll of the dice" theme, but it would definitely add a lot more strategy and is a really good suggestion.
Also, the 70/71 bug is there because I have the enemy spawn rates increase as your score does. The spawn rate is supposed to increase after 70 points gained, but I accidentally put the score check to trigger the spawn rate increase if the score is over 71, rather than over 69. A really stupid mistake really, and something I was able to fix instantly, but by the time I found out it existed in the first place the submission deadline had already ended.