In adventure, the collider for the bat enemy appears to be off. The collider is at the very top of the bat sprite, and not instead where the shadow is (ala the player's collider). As a result, this positioning causes damage : https://i.imgur.com/lfMthJB.png, while this positioning does not : https://i.imgur.com/3m2MFEN.png. I believe the collider for the bats should be moved to where the bat's shadow is, instead of where the bat's actual visuals are.
The lives system appears to stop docking lives on death after several rounds. https://drive.google.com/uc?id=1EvHC95XlkTRx-eZDGDWDTgIMgv4Ext8I
The game over screen seems to disappear as soon as a player presses any button. While players should probably be allowed to expedite things if they become impatient, failing to implement a "minimum waiting time" for certain screens may lead to situations where players with nervous habits (such as tapping buttons) cause them to skip past something before understanding what it is (especially if it appears suddenly with no transition). With the game over screen, younger players might not have time to read what is being displayed before their interest in pressing buttons causes them to accidentally skip it. As an example, I tend to rapidly press the arrow keys in a circle while waiting for something, since arrow keys by-and-large never cause a menu or cutscene to disappear in other games.
In adventure, the giant worm's sprite falls below its shadow, which doesn't make physical sense. https://i.imgur.com/2FFqdYN.png
In adventure, the Pathway object looks more like a hedge sticking out of the ground (that would block movement), rather than a path that should be walked on. Making the object brown may reflect its purpose better, as most players will be familiar with pathways being dirt paths, instead of differently-colored grass. Rollercoaster Tycoon took this approach (https://i.imgur.com/czH3Ge9.png).
Stardock gets credit for the game I made in the "Play a Game" menu. https://i.imgur.com/Rcu8jzI.png
I believe there is a typo in the sidescroller game type description (https://i.imgur.com/6euGbEs.png). I believe there should be a possessive apostrophe after "players" to make "players'".