This match is not 5-5… I think it’s 6-4 or worse.
You first have to figure out what type of Abel you’re playing against. If they are the standard “I don’t give a FUCK!!” Abel’s, then just rush them down, since they most likely suck at blocking or aa’ing. They are gonna have NO respect for your game, so you shouldn’t respect theirs either. Just go in and fuck them up.
If you are playing a “smart” Abel (who can actually play footsies and punish your shit), you can’t get away with just going in there and doing shit. You have to earn your knockdown. St.strong, cr.hp, st.hp, and jabs are good. Don’t just do balls, since they can all be punished for half your health. DON’T let him corner you, since you will probably die since all of your escape options can be severely punished. Just stand your ground and try to knock him down. Don’t play too cautiously either, since that’s just opening up for him to dash in and fuck you up. Pay attention at how they are getting in, if they roll a lot or jump, punish that shit (you can punish a roll on reaction with your slide). If they are walking, you better brush up your footsies 101, cause it’s gonna be tough.
Alright, let’s say you are standing your ground and you score a knockdown… Rush that shit down. Go for your ambiguous setups and don’t let him breathe, this is your only shot at scoring big damage in a short amount of time. Once he guesses right and is out of your shit, just chill again, because if you keep trying to get in that ass, you will die very shortly (again, I’m talking about playing against a competent Abel…).
Pay attention to step kick range… Try to avoid that move, and if you see that they do nothing but step-kick in that range, just jump/sweep his ass, since step-kick doesn’t have a good recovery on whiff. Backdash after a blocked step-kick once in a while and see if they know how to punish (most Abel’s don’t… so it’s pretty free).
On knockdown, guess. Seriously, Blanka doesn’t have a “GTFO for free” move… You can ex.ball once in a while, but if it’s ever blocked, you will lose a large chunk of health and will be back in the mixup. Saying that though, don’t be scared of showing the Abel that you will take risks from time to time… It keeps them in in check.
Besides that, just don’t give away free damage… AA and punish rolls properly, punish stupid shit they do, don’t let them get away with the same shit over and over, and just make them work for the knockdown in general.
I don’t play Blanka, but this is how I would play the match if I was in their shoes.