path 18 is the part with the shadows and the bird portal leads to an unfinished level select thats going to be in the game just you'd need the other level files which dont have much changed except 1 screen on monsaic lines. i'll do some more tonight when i get back from college
and yes it will be a abe in sonic
if you played sonic
Rupturefarms - flying battery
Stockyard - casino night
monsaic lines - hidden palace beta
Scrabainia - sandopolis
Paramonia - hilltop zone
stockyard return - not sure yet maybe chemical plant
rupture farms return - sonic and knuckles death egg
but did you manage to find how to get to secret area's? although once i add new doors it wil be obvious
the other version i'll make is abe's oddysee long version with working condemmed doors harder secret places