Samus projectiles are pretty good if they actually hit you, but most of them aren't too hard to avoid. You can simply nair through the missiles with your moves. I suggest to do it with aerials (nair is probably best) to stay mobile. Your projectile on the other hand can't be destroyed and is way more usefull. Your laser is very important. It can be used for a lot of things like edgeguarding, approaching, gaining space etc.
When you approach you need to be carefull because you don't want to attack her shield too much. Her Up-B is hella quick and will even beat an L cancelled aerial into shine. Also watch if she crouch cancels. If she does it's better to back up and laser a bit more because if you go in you'll get a down smash in your face. Her little down b bomb can also be usefull to create a small wall when you approach so make there aren't any of those if you approach. Laser grab is very good if the samus shields a lot or even shield grabs. Once you get a hit with your aerial you obviously want to take it as far as possible. It's hard to combo with shine on floaties so i prefer uptilt most of the time but shine will work if you're quick enough. After that you want to hit him with a dair again and *make sure you fastfall after it*. After your second dair you really wanna pay attention because she might be able to get out a nair before you can follow up your combo. A simple wavedash away can get you out of the hitbox and you'll be able to follow up from there. At higher % it's better to combo aerial into aerial like dair to dair or dair to nair. Your kill moves will probably be bair, nair, dair, f smash and d tilt most of time. I really like d tilt since it's fast and kills around 100%.
Moves you need to look out for the most are nair, d smash, up b (already talked about it) and grab. Her nair is one of the best sex kicks in the game. It stays out long and is great for edgeguarding. If you notice the samus always goes in with nair for edgeguarding try to stay further of the ledge. If she uses it for approach you can laser her down shield and then maybe shine oos. You never want to walk into a d smash (like leffen vs duck at dreamhack on FD). It's not as bad as peach but you will get comboed. Most samus players use it after they crouch cancelled something. I don't really know a solution for this but i think it's just about knowing when they're using it and trying to avoid the CC's. Her grab is the longest in the game but also has a long startup time. You can try to bait it with some tricky movement but you gotta really watch your spacing. If you can react to it, don't underestimate the length of it and run back a bit and then you get a free punish. Spot dodge can also work but you need to watch your timing when doing it.
I don't have a lot of experience with samus myself but i know it's very playeble once you understand the matchup.
Some nice vods to watch from the matchup are westballz vs plup at tbh4, ppmd vs hugs at evo and mango vs hugs at mayhem
