1.It's endless & there will be an offline high score system.
2.Yes I showed a picture of level 100 on my devlog but that does not mean that is the last level. In level 100 the difficulty is set to maximum & beyond this level, the difficulty will not increase. I used it to showoff the difficulty system. I don't think a normal player would ever reach that level (Player's will probably lose at level 10 or sooner). The gameplay loop is kinda similar to Lethal Company, you try to progress as much as possible but if you lose, you go back to the beginning. The levels are also randomized.