this makes for a very interesting proof of concept! the sonar system works really well, the shader is impressive, and the audio is nice (although the delay between the beep sound playing and the sonar actually beginning to uncover the environment was a bit disorenting at first).
we actually felt a bit tense during the first playthrough when the deer showed up behind, so bonus points for that too!
all in all, this is quite impressive for only three days of work, and we actually wish there was more to it!