Level 1 : HEYYO
Level 2 : UAREA
Level 3 : COOLG
Level 4 : UYYOU
Level 5 : HAVEN
Level 6 : OTICE
Level 7 : DTHAT
Level 8 : THISI
Level 9 : SAHID
Level 10 : DENME
Level 11 : SSAGE
Level 12 : IFYOU
Level 13 : WANTT
Level 14 : OHAVE
Level 15 : ANICE
Level 16 : CHEAT
Level 17 : MODET
Level 18 : YPECH
Level 19 : EATAS
Level 20 : AFILE
Level 21 : NAMET
Level 22 : HENYO
Level 23 : UCANG
Level 24 : ETTOT
Level 25 : HENEX
Level 26 : TLEVE
Level 27 : LBYPR
Level 28 : ESSIN
Level 29 : GCONT
Level 30 : ROLAN
Level 31 : DSHIF
Level 32 : TANDC

... also suggests hat if you enter CHEAT as a load/save filename, you'll be able to press CTRL SHIFT and C during play to skip a level.