It's very hard to get Duke to turn around, especially when facing multiple winged demons. I like the background, but the laggy animation takes a lot away from the playability. The "ASDF" controls are fun, once I got the hang of them. I haven't read Braver Than Angels, but I'm wondering if there are any enemies besides the winged demons and that doctor (I can't remember his name, since I only reached him once). Often, I get hit from both sides, and keep getting knocked back down before I have a chance to stand back up. Perhaps a (brief) grace period, once Duke is standing again, just to give us a chance? So far you have a good start, keep going!
Thank you very much. We're currently revamping the entire fight system to alleviate these issues. Yes, there will be many other enemies in the future releases - basically this is a test run to see feedback and what we should change.
Perhaps an area attack where he gets back up and does a spinning kick to knock them away would get rid of this annoyance.