Yep I would agree on folding vs unknown and betting river myself (likely need to size down close to blockbet).
Also I'm thinking to size up turn, 4 is just great turn card, we want to go big with our bluffs and value (99+?) to shove some rivers ^_^

Ya I was thinking size turn so you can shove river. Might be a bit ambitious to rip all in anyways but it is 25nl and who folds boats right? Vs select players I would def shove.

As played ya he s likely thinking "who folds a boat right?" :D

With some serious consideration I would fold this but his value range so narrow: A4s, 45s (maybe). KQdd, KJdd, 77 and so many busted FDs and Straight draws.

The only serious reason for folding IMO is because I think villains won't bluff enough in this spot.

Can you post some relevant stats?
I'm leaning toward a fold but have some stats life VPIP, PFR and some aggression frequency would help to profile the player. If the player is really active, I may find the call button.

I'd only call if I know villian is a fishy spazzy player that continues on the turn with all his draws. I'd fold otherwise, the big size is generally underbluffed by a large margin, and I don't think this is a board texture that gets bluffed very frequently.

But if he's a fish I'd block river expecting to get called by 7x, any PP and A-highs, and fold to a raise.

I think flop sizing is too big altough not sure about this one. I think I'm jamming river