Thanks for your feedback! Yes it is normal :D We could not make sound and music in time and instead just put our effort into polish and gameplay. A version with sound and music is coming though . We will announce it in on Twitter under @snailspacegames and update our itch.io page accordingly.
I was going to ask the same thing, a pity the game with sounds gains a lot, but I'm glad you polished the game instead of adding sounds that are somewhat irrelevant to gameplay (not totally but...). Looks and plays awesome!