Issues:
x991y1000 - bank 254 objects that are visible in KS Ex.
x965y990 - multiple ways to wallswim here when coming from below.
Lacking save spots:
x964y991, x972y1008, x994y990 (probably some more places)
I never felt like enemies were random, maybe except x980y993 to a degree. There you can get a bad right shooter on the way back and would need to reenter the room so that it doesn't shoot at the topmost lane (wasn't an issue for me).
I also didn't feel like the music was too loud.
I agree that difficulty should be Very Hard. Why are there 2 difficulties?? It doesn't have a choice of difficulty. On 2 instances you end up on a slightly harder path without a key or on a less challenging path with a key basically at random. Why harder path is the one without a key is also weird.
- Для красного ключа добавить дополнительную подсказку-замануху в верхний коридорчик. А то пройдя по нижнему коридору видишь что вверху лазер перекрывает дорогу и сложно предположить что туда нужно идти.
- Не нравится когда в игре есть разные пути и чтобы пройти второй придется играть заново.
В какой-то мере эти 2 пожелания противоречат друг другу :)