Thank You all for replies,
LTC6992 would be very nice, but to get it in my country will cost too much, other IC is just too complicated compared to ATTINY.
I think I'll go with ATTINY85, bonus of using it that I could feed rotary encoder and limits switches to it and monitor if something went wrong, for example if motor get stuck (no rotaty pulses) but no limit was activated I can disable PWM.