Wow this is one yawn inducing Sonic clone I'll recommend you to avoid. It has some things going for it. Superfrog is a functional platforming game with nice vast levels built for exploration. There are multiple paths, hidden secrets and invisible blocks (with coins in them). 6 'themes,' each with 4 levels and 3 extra bonus levels for each world since its the HD version. It is a good game for children I guess. This is an easy game. Very, very easy. So easy you can get 5 achievements on the first level. 5 out of 12.
Now starts a laundry list of problems that I have, your jump is very floaty. Very high and floaty. I understand that you're a frog, but it feels like there is almost no gravity. If the jump wasn't floaty enough, luckily there's a power up that allows you to hold the space bar / jump button in mid air, so you can slowly float down. There are a good variety of enemies, but some of them are just extremely small and either blend in with the background or one of the thousands of things you can pick up. There are so many things to pick up on screen at once that the enemies will blend right in. You'll collect bananas, gems, red coins, green coins, blue diamonds, cherries and much much more. There's just too many things everywhere. Like clutter. What do the pick ups do? Points pretty much. What do points do? Eh high score?
In the extra bonus levels made for the HD version, you'll need to collect coins in each level to unlock the exit door. It just seems like more work than I want to do for this game, even if coins are everywhere. Especially if the only coins you missed were in the beginning of a level, you need to backtrack all that way, hoping not to walk into spikes (instead of jumping or falling on spikes).
There are signs everywhere to point you in the correct direction. It is a very forgiving game with a small 5 hit health bar, but the real problems are spikes meaning instant death. You don't even need to fall into the spikes, you can walk into them and you'll die even if they're almost as tall as you.
You can run up and down hills, but your run never gains momentum. You can stop on a dime, even in mid air. There's no momentum or inertia like in Mario and other such platformers. The stopping on a dime thing might be helpful since there are usually enemies at the end of long runways and since you're a frog, you can't exactly curl into an attack ball like Sonic. Standing on a hill won't pull you down A hit from an enemy will make you flop over, stopping you, then make you briefly invincible.
Every time you turn your character right to left or left to right, the screen will rubber band back and forth. It is very jarring. not just that, but springing high into the air will zoom out the screen, then zoom back in when you hit the ground. It can probably induce motion sickness for some people. Spring boards can put you through rock ceilings, because there is poor hit detection stopping you. Sometimes it will pop you straight through to a different level. That's forgivable.
Each level feels like a jumble of ramps, platform, springboards and so on with a different theme paint. While the levels feel good, they don't feel different. Its not like how Super Mario World had water levels, and sky levels, and ground levels. This is just all the same, level after level, like a maze for kids. The water in the circus theme levels isn't swimable. Its just a background for fish enemies.
Even with a frog protagonist, this game doesn't do much with a frog. You don't use your tongue, there are no insects to eat, no trees to climb or swamps. No real super powers other than floating with your cape. The game just feels very generic, dull, uninspiring and boring. The only thing you can really do is jump and duck.
Maybe there are fans of this game that have some sort of nostalgia to it, but I'm not one of them.