cjbruce nice first playable game made with Q3D ive'd seen so far outside the official demo, Great job.
if u used Q3d before would be very weird to switch to babylon ... q3d has the c2 simplicity or maybe i got to used with it. but there are 2 plugins that are worth trying, to see which fits your need.
they would probably both support your game that you want to make, is a matter what game you want to make with it? underground? call of duty warfare? cause that are possible, but not with C2 as a engine its just not meant for that kind of processing. but you could do a 3d mario land, or 3d sonic adventure type of game. 3d platformers, 3d racing all possible. but would require you to keep the models as lowpoly as possible.
P,S (babylon is a bit faster=more models supported in 1 scene.)