tylersalt, the game autosaves so you can come back later and pick up from the last checkpoint you reached.
Unfortunately on old computers, the controls get sketchy. There's not much I can do about it, it just needs a decent computer to run :/
A lot of people with macs say the game won't go past the spinning sword. I can't really narrow down the problem since I don't have a max myself, but if anyone that does have a mac would like to help debug it, please let me know.