Trying to get all the achievements. Speedrun and No Death and All Orbs.
First Level was easy Deathless, Second took me tons of resets because I wasn't totally getting the jump height right. Third got it first try. 4th, that spike that I can just run into. Argh. 5th... The spike wheels are the most annoying right now.
And yeah, playing on full screen is very very recommended.