Hi there. I have taken a look at this game and I have a few criticisms. Also made a video about it so check it if you like below.
1. I did appreciate the change in sounds from the usual Siren Head sounds but it would be a bit better if you could do sound play. Actually hearing where he is and how far he may or may not be away.
2. I am sure many had this issue before but Left Click does not work. If you wanna throw a Paper Plane you have to press R. Please fix that cause your tutorial does not match the button at all.
3. I am not sure if that is random or a bug but can we have more Airplanes. Cause 5 or in one round 4 Paper Planes is really not much considering how hard this game is. I played a few Siren Head Games so far but considering how easy it is for him to just suddenly walk over you or near you and your spotted well... it would be better if you have my throwables or at least at each puzzle some new ones to pick up.
4. This is probably wrong of me but I am not sure. I guess the map is changing every time you die which makes it really hard to find anything. If I am right then you could make a life counter. Like 3 tries and then change the map.
Those are a few points that I have to point out. It's just some personal opinions so do not take it like I am harsh on you.