I found 2 skips in level 3 and level 7. both these levels have spikes, but I found a way to not wait for the battery to run out or the spikes to go down to progress. if you jump on the very ledge of the platform with spikes, the character wouldn't die. You can only use this technique in lvl 3 and lvl 7. Here are the demonstration videos: lvl 3 battery skip

lvl 7 spike skip

Pretty disappointed that I didn't use the level 3 skip in my run, that's a free 2 second save :o