At least do 2.5D - those backgrounds are too good to give up. How could a 3D environment be cheaper? I don't imagine it would be...
And also, I'm not sure if anyone suggested but AGS (adventure game studio) forums have a great support network with a lot of people offering their services in different areas if you still need people (Am I allowed to advertise another forum...?
).
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KRAMS DESIGN - Indie Game Design & Development
Now playing: The Longest Journey, Gray Matter, Lost Horizon
Recently finished: Sanitarium
Looking Forward To: Deponia, Resonance