Maybe you already his Retro Caves levels? based on old school platforming in a Bubble Bobble style alike ,

If not i advice you to play them, it's 1-4p =>
http://i5.lbp.me/img/ft/b957870a16ef2db51e4f94eb5b61d1666e2666db.jpg
http://i3.lbp.me/img/ft/f33ca1d4bc5e680a2b3b7f724c7642d264e98534.jpg

http://lbp.me/v/fzjfj6
http://lbp.me/v/b3xksx

He also made a fun shooting scoring concept very basic but really fun named "Ruff n Tumble", there's currently 2 stage , only solo here =>
http://ic.lbp.me/img/ft/30c2bf663dad1e2afe911dffd845c15a99926cd8.jpg
http://lbp.me/v/xqbfsc
http://lbp.me/v/xpbbzf




He also did The Adventure of captain Plasma which look promising too, i just quickly check the trailer, will give more info soon about it.
pics for Captain Plasma level =>

I played the trailer of Captain Plasma explaining the plot & the control player & it's a level based on Captain Plasma you're controlling. You've got double jump abilities , and also with L2 & R2 the side laser shooting : i mean with L2 you shoot on your left side , R2 on your right side.

http://i4.lbp.me/img/ft/6b4e66d395ceaf2133722d70a04f63c24f03e94b.jpg
http://i1.lbp.me/img/ft/271b6aec69944310a0e12de5c5d1c7a455d34075.jpg
http://i5.lbp.me/img/ft/0d536d59ce038ecdb3552a106b990a6c8c01f928.jpg

http://lbp.me/v/7qdsv5

Last news => Retro caves 3 just been released yesterday , this one seems to be co-op able up to 4p too

http://i4.lbp.me/img/ft/394259f91cf42ff27196eca7e55058f1d9c29336.jpg
http://id.lbp.me/img/ft/23de1321b706ba03c8b0ecfa6a80f5ee027c54e8.jpg
http://i2.lbp.me/img/ft/d227c039cb5d889244ab7e433262a22da83005d4.jpg
Boss
http://i9.lbp.me/img/ft/6997c1bdfdaec4c83882c80083a2216d9652be71.jpg

http://lbp.me/v/kdfm-m

Looks very good!

Looks promising! Got it queued

Musslerini created some great levels!
Very good recommendation