I'd the same question as you re solo play before I took the plunge.

So I'm now playing solo and really enjoying it so far simply because I like exploring and building in a fairly open environment.
I've also no interest in playing multiplayer as I want my world to be my world.

I think enjoyment from playing this solo will depend on the type of player and what they need from a game to make it fun for them.

I can however see how Valheim will play quite differently as a multiplayer experience (in terms of resource collection, combat, boss battles, etc) versus solo.

Finally, I bought it on sale a few weeks ago at around £12 so hard to go wrong at that price point - knowing I was only interested in the solo experience I held off buying it at full price.