Using 1 hand to play

[valtiel 89]

Been killing some time with this game lately but as of yet i've only been using one hand on the arrow keys to play, that's thumb on left, index finger on up and down and middle finger on right . I'm guessing this might be quite problematic on the tougher levels but nothing else feels comfy, had a quick browse through the facmapping thread but basically i just want to know if it's actually possible to attempt the harder levels with just one hand on the arrow keys.

Thanks in advance!