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Assuming one offers an online service on a page using HTML5 + JavavaScript. Technically speaking, it can be considered as a web application.
Is the WebApplication type appropriate for this page or should it only be used for references to web applications (i.e., reviews etc.)?
According to Wikipedia, a web application is:
Any application that uses a web browser as a client. The term may also mean a computer software application that is coded in a browser-supported programming language (such as JavaScript, combined with a browser-rendered markup language like HTML) and reliant on a common web browser to render the application executable.
Since this matches the description of your web application, I don't see why you couldn't use Schema.org's WebApplication for web applications.
According to Google's docs on rich snippets for software applications, you should likely include the browsers property to describe the browser requirements, for example: "Browser required with HTML5 and JavavaScript support".
