Game looks great - Through it's laggy with Opera on Windows 10, making the game play fastidious - I keep re-spawning near the first spikes, so I wish there more more save spots and that we didn't need to restart from zero.
Like other have said, controls don't feel great... and as each player is different, imo, customization seems the best option. (imo, controls are so so important: If players can't get confortable with the controls, the game won't be played. Also remember that there are many types of keyboard on this planet: QWERTZ, QWERTY, AZERTY...)
Anyways, as lag might just be a personal issue, I'll ignore it and rate 5/5. Keep it up!:)