Well, is short but is about the same time that you need to complete any classic Megaman, and those games are a joy to play (except the first one...)

I might give a try to the HD collection coming to the WiiU if is not too expensive.

Really? That´s an awesome price for a 1080p 60fps version with the 2 games, I´m alredy sold. 

Tips on review writing:
Don't try to separate a review into defined categories. Although having a template is nice, it can force you to try to elaborate on details that really aren't all that relevant to the game in question. For example, sound generally isn't worth a mention unless the music is really good or really bad. Or if certain sound effects inhibit the experience. A review seems much more natural if you can find a way to make it flow from point to point without having to use headers. I personally use screenshots as an effective way to end one point above it while transitioning into a new point below it.

Find a way to introduce the piece. Instead of just using the title and then digging in, have a paragraph that introduces your readers to the game and your approach. As a quick example of how you could do this with Gunman Clive:

"It's the Wild West, where outlaws run free, and crime is just a part of daily life. As Gunman Clive, you set out to take back Mayor Johnson's daughter, who was abducted and is being held captive. Does this small title have what it takes to make you feel like the best lawman around?"

^This is nothing all that special, but it gives a general idea of one of many ways you could choose to introduce a game at the beginning of a piece. Obviously it is a lot easier when the game is fresh in your mind than it was for me having not played Gunman Clive in over a year. Regardless, from that point, you could naturally transition into talking about the gameplay, what it does right, and where it could be improved, without the need for additional headers.

Of course, spell check and editing is important. I read over my reviews four or five times at a minimum, have somebody else edit them, and then look at them a couple of times again before sharing them. It's all about that quality.

Screenshots! I mentioned them a little bit earlier, but screenshots are magnificent. For the 3DS, they can be a tiny bit of a pain, but that's only really if you're doing a review copy or are trying to review a game that lacks a Miiverse community. Regardless, sometimes using Googled gameplay images is the best way to do things. For any system where screenshot capabilities are readily available, it's encouraged to secure your own screenshots. It's really up to you how many you want. I usually aim for four or five and, like I said, I use them to break up my review. Other people go screenshot crazy and will put in 20 screenshots all as thumbnails, or one main screenshot at certain intervals with the rest as expandable thumbnails underneath.

For just a small thing, reviews tend to shine best with plenty of detail. I know it's harder on a small title like this, but shooting for at least 1000 words is generally recommended. I've seen someone spin out 1100 words on one of those Candy Crush clones, so I know it's possible. It can just be a pain.

Granted, if you don't want to follow any of these tips, it's up to you. I figure if you're sharing a review though, you must have some interest in increasing your overall future review quality.