I liked it, it's quite fun to play within little breaks for instance even though the purple soul frenzy seems pretty overkill and the text seemingly isn't correct in shop and end screen. In shop it says each soul counts as 1 or 2 or whatever but your soul-value seems to have a multiplier of 2 and in the end screen you forgot a space in front of I you if I remember right. ;)
And personally I would prefer an audio loop. After the track/tracks ends it feels a bit empty without sound. (or is it a bug?)